I think since we have Gazi, there will be less pressure for Shakib to bowl his full quota. So we can afford him to bat at #3 if we dont find a suitable replacement. Mushy to me is the perfect #6 or #7. We all know he has potential if he bats at #4 and make a good score but he doesn't do it often enough. At #7 you dont necessarily have to be a consistent batsmen, just bat under pressure and make some quick runs which he can do effectively.

In all honestly Nasir deserves to be ahead of Mushy in the batting order.